Bending machine



A. WAGENBACH BENDING MACHINE April 18, 1933.

Original Filed Marchi 1928 2 Sheets-Sheet l April 8,1933. WAGENBACH' 1,903,799,

BENDING MACHINE Original Filed March 1928 2 Sheets-Shem.

Patented 18, 1933 UNITED STATES PATENT OFFICE Y we waeamcn, or anagram), GERMANY alumnae momma Application filed 1mm 10,1928, Serial no. aeoaas, and mam-man September 24,1927, Renewed I February 91, 1938.

, The invention concerns a bending arrangement for bending. machines adapted to bend various forms, as particularly cross bows,

oval and angular spiraloid curves, which are employed in iron concrete.

The invention consists therein that a, vertical shaft, penetrating through a horizontal frame plate, bears a driver and-thereabove a bending arm seiz'able by means of the driver and driven'in .the opposite direction by a return spring. A The advantage consists therein, that the return movement of the-bending arm results automatically and that the bending shaft is able to' turn'continuously in one direction, without being forced for producing anew bend to .be first slowly guided back again into its original position by a reversing gear; A further advantageous arrangement consists therein, 'that in the frame plate a filo number of holes are so provided, that anabutment for loosening the driver from the bending arm can be fixed on various points, In this way it is possible to execute bendings about angles ofvariable measurements very 5 quickly and particularly exact.

The driver is further mounted on a circular bending disk, which likewise contains a number of holes, into which bending bolts or bending rollers can be inserted so that, when dismounting the bending arm, also b means of this bending disc polygonal ben ings of spiraloid' or helicoidal shape can. be produced. Further also the bending disc can be dismountable, so that by mountlng a'bending roller upon the bendin shaft and additional rollers upon the rame plate also greater curves -.in the manner of three-roller bending works can beproduced. J

A valuable feature consists at last 1n applying an abutment ledge provided wlth holes, which extends from the bending shaft so that the iron rods to be bent can be fed forward up to an abutment-and the length of any piece to be bent can-be simply and exact- The drawings show the invention in employment for bending cross bows for iron concrete.

- Figure 1 .is afrontal view,

Figure 2 is a plan view,

' Figure 3 is a side view.

Through a horizontal frame plate 1 ofthe bending'machine a hexagonalor octagonal mounting tap of a vertical shaft 2 extends,

. on which a bending disc 3 is so mounted as to rotate with the shaft 2. A bending arm is held freely rotatable there above on the shaft, and is pulled by. a return spring, designed as a screw sprlng 5, into the resting position they spring being attached to a pin 7 of the bending arm.

A driver 6 held by a pivot 6' upon the turning bending disc engages a rib 9 of the bending arm by its surface 6', and takes along with it the bending arm 4 until the drive 6 runs by its surface 6" against a loosening abutment 8 and thereby is so tilted incounterclockwise direction that its surface 6" disengages from said rib 9 and lets the arm 4 jerk back.

For quickly and exactly adjustin the desired bending points an abutment edge 10 is provided, havin holes 11 for inserting abutment bolts' 12; or the first hook bending an end'abutment 13 is provided. The bending takes place around a roller 14; arranged centrally on the shaft 2, by means of a bend- .ing roller 15 fixed on the bending arm 4. For holding the iron straight a clamping disc 16 on the abutment ledge 10 is provided. J I

When the bending arm 4 and the driver 6 are taken off and bolts are put into the holes 17 of the bending disc 3,1t is possible to bend cornered curves of types similar?" screws or spirals by uninterrupted rotatl of the disc the wire running to the bending machine from a reel mounted besides the bending machine with a braking action serv ing for obtaining a sufiicient wire tension.

Instead of a disc with holes a disc radial slots can be" arranged on the frame?""'late' 1 by using the roller 1'; as a diivingrol era'nd mounting two bearings with further rollers with vertical axison the frameplat'e 1- by? using the holes 18 for fasteningsaid rollerbearmgs. The starting apparatus is actuated by .a footlever 20, which for uninterrupt a? bending is locked by alo'ckingeccentric loo The action in bending cross bows for concrete iron is the following; the iron rod to be bent is inserted between the roller 14 and the clamping disk 16 and pushed forward against the abutment 13. Thebending disc rotating in clockwise direction takes along with it the bending arm 4 by its driver 6 catching a downwardly directed rib 9 of said arm, till the driver runs against the loosening abutment 8 shownin Fig. 2 for example at a 180 position which means that by the roller 15 an end hook is bent, and the arm is returned by the spring 5. The rods are then reversed end to end before the bending disc begins to take along with it the bending lever 4 for the second time, which in the same manner of insertion of the iron (as shown in the drawings) produces the second end hook bending by aid of the roller 15. Also the third and the fourth bending are produced in the same manner, but forthis case the loosening abutment 8 is brought into the 90 position, for bending these corners at 90,

in contradistinction to the end hooks bent at 180. The movements of the arm (1 are for each bending procedure marked by an arrow line.

By changing the abutment length and the turning direction all kinds of concrete iron can be bent in uninterrupted operation.

Instead of the designed tension spring 5 a leaf spring or a spiral spring, enclosed in a turning case, can be used.

I claim:

1. A bending machine, comprising in combination a frame plate, a substantially vertical shaft extending upward through said frame plate, a freely rotatable bending'arm on said shaft, a driver arranged on said shaft above said frame and adapted to rotate said bending arm when said shaft is in rotation, means for automatically bringing said driver out of engagement with said arm, and means for withdrawing said arm into a resting position when disengaged.

2. A bending machine, comprising in combination a frame plate, a substantially vertical shaft extending upward through said frame plate, a freely rotatable bending arm on said sha ft, a driver arranged on said shaft above said frameand adapted to rotate said bending arm when said shaft is in rotation, a pivot holding said driver on said shaft, an abutment adapted to be fastened to said frame plate in the way of said driver so as to bring the latter out of engagement with said arm as soon as the driver runs against said abutment, and means for withdrawing said arm into a resting position when disengaged.

3. A bending machine, comprising in combination a frame plate, a substantially vertical shaft extending upward through said frame plate, a freely rotatable bending arm on said shaft, a spring extended between said arm and said frame plate so as to draw said arm into a resting position, a driver arranged on said shaft above said frame and adapted to rotate said bending arm oppositely to the pull of said spring, and means for automatically bringing said driver out of engagement with said arm.

4. A bending machine comprising in combination a .frame plate, a substantially vertical shaft extending upward through said frame p ate, a freely rotatable bending arm on said shaft, a driver arranged on said shaft above said frame and adapted to rotate said bending arm when said shaft is in rotation, means for automatically bringing said driver out of engagement with said arm and means for withdrawing said arm into a resting position when disen aged, a ledge provided with holes, extendmg from said shaft in one direction, means for fastening said ledge to said frame plate, and abutments adapted to be fastened in said holes of said ledge.

In witness whereof I affix my signature.

ANTON WAGENBAOH. 

